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    The sacrum is a large triangular bone at the bottom of the spine. It is inserted like a wedge between the two hipbones.

    The sacrum is shorter and wider in women than in men.

    Current as of: February 20, 2015

    Author: Healthwise Staff

    Medical Review: Anne C. Poinier, MD - Internal Medicine & C. Dale Mercer, MD, FRCSC, FACS - General Surgery

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